Very simple Roles library without any authorization enforcement supporting scope on resource objects (instance or class). Supports ActiveRecord and Mongoid ORMs.

Ruby/Graphviz provides an interface to layout and generate images of directed graphs in a variety of formats (PostScript, PNG, etc.) using GraphViz.

Add easily configured security headers to responses including content-security-policy, x-frame-options, strict-transport-security, etc.

A Ruby CLI gem that beautifies the terminal's ls command, with color and font-awesome icons.

Airbrake is an online tool that provides robust exception tracking in any of your Ruby applications. In doing so, it allows you to easily review errors, tie an error to an individual piece of code, and trace the cause back to recent changes. The Airbrake dashboard provides easy categorization, searching, and prioritization of exceptions so that when errors occur, your team can quickly determine the root cause. Additionally, this gem includes integrations with such popular libraries and frameworks as Rails, Sinatra, Resque, Sidekiq, Delayed Job, Shoryuken, ActiveJob and many more.

attr_required and attr_optional

This gem provides a mitigation against CVE-2015-9284 (Cross-Site Request Forgery on the request phrase when using OmniAuth gem with a Ruby on Rails application) by implementing a CSRF token verifier that directly utilize `ActionController::RequestForgeryProtection` code from Rails.

HTTP Accept, Accept-Charset, Accept-Encoding, and Accept-Language for Ruby/Rack

A lightweight Sass grid framework

Light weight job scheduling on top of Resque. Adds methods enqueue_at/enqueue_in to schedule jobs in the future. Also supports queueing jobs on a fixed, cron-like schedule.

GitLab style guides and shared style configs.

Blazing fast application deployment tool.

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web. http://getbootstrap.com

Dpl (dee-pee-ell) is a tool made for continuous deployment, running deployments at Travis CI.

Fluentd Output filter plugin. It has designed to rewrite tag like mod_rewrite. Re-emmit a record with rewrited tag when a value matches/unmatches with the regular expression. Also you can change a tag from apache log by domain, status-code(ex. 500 error), user-agent, request-uri, regex-backreference and so on with regular expression.

A library to read/write files/spreadsheets in Google Drive/Docs.

Run shell commands safely, even with user-supplied values

Haml-rails provides Haml generators for Rails 5.1 and above. It also enables Haml as the templating engine for you, so you don't have to screw around in your own application.rb when your Gemfile already clearly indicated what templating engine you have installed. Hurrah.

Interactor provides a common interface for performing complex user interactions.

A generic SAML strategy for OmniAuth.